克托尼俄斯（希腊语：χθονιος，字面意思为“属于大地的”）是希腊神话中的地神的统称，指称在地下世界生活的神和灵魂。

希腊语中有数个代表“大地”的词语，khthon是其中一个，它的确切含义是“大地之内”，而不是地面的世界（gaia，盖娅）或是作为领土的土地（khora）。它的直接引申义是“丰饶”和“坟墓”。

克托尼俄斯一般被认为来自希腊史前居民所信仰的巫术，其行为和显圣的方式都和奥林匹斯神大相径庭。他们通常为农业社会的一些宗教团体所崇拜，维系了某些特定的宗教仪式，例如厄琉息斯秘仪等。

Chthonic (UK /ˈkθɒnɪk/, US /ˈθɒnɪk/ from Greek χθόνιος khthonios [kʰtʰónios], "in, under, or beneath the earth", from χθών khthōn "earth") literally means "subterranean". The translation of meaning discusses deities or spirits of the underworld, especially in Greek religion. The Greek word khthon is one of several for "earth"; it typically refers to the interior of the soil, rather than the living surface of the land (as Gaia or Ge does), or the land as territory (as khora (χώρα) does). It evokes, simultaneously, abundance and the grave.